‘4 
196 On the Measure of 
figure to its original state, and has, together 
with the remaining force of A, been commu- 
nicated to B. If this explanation be applied 
to the change of motion produced in C and D 
Fig. 7, as referred to at page 185, it must be 
obvious, I think, that when C is brought to 
rest, the force which it has lost, and the force 
of the spring, have both been communicated 
to D. “ 
In the collision of unequal masses, the dis- 
tribution of the force is rather more compli- 
eated. Let M (fig. 15) be immoveable and 
filled with a dense elastic fluid so that N, mov- . 
ing with the velocity v and meeting with an 
uniform resistance, would be brought to rest 
by driving the cylinder C up to O. Then if 
we suppose M, = 2N; to be in free space, 
and if we divide O P, = OR, into nine equal 
parts, and make OS=2:OR, it will be 
obvious, that when N has arrived at S’ its 
velocity will be = and M will at the same 
time have arrived.at 2’ and will have acquired 
the velocity =, and the penetration of C into 
M will be 2 OR.—In this part of the operation 
then, N has (on the principles adopted in ex- 
plaining the last case) lost, or rather given out, 
£ of its force; of the effects of which 3 are 
found in the acquired motion of M and $ in 
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